Type-writing machine.



N. H. ANDERSON.

TYPE WRITING MACHWE.

APPLICATION FILED JUNE 12. 1914.

Patented Nov. 7', 1916.

WITNESSES. -6 'Rik 4 A TTORNEY8 NILS H. ANDERSON, OF MIDDLETOWN,CONNECTICUT, ASSIGNOR TO THE NOISELESS TYPEWRITER COMPANY, OFMIDDLETOWN, CONNECTICUT, A CORPORATION OF CONNECTICUT.

TYPE-WRITING MACHINE.

Specification of Letters Patent.

Patented Nov. 7, 1916.

Application filed June 12, 1914 Serial No. 844,659.

same.

This invention relates to typewriting' machines, and with regard to themore specific features thereof, to improvements in the carriagebalancing mechanism associated with the carriage shift mechanism.

One of the objects of the-present invention is to provide a simple andpractical carriage balancing mechanism whereby a freer acting shift ofthe carriage is obtained.

Another object is to provide a mechanism of the above character capableof'various,

adjustments of the several working parts to render the mechanism morereliable and efiicient in use and operation.

A further object is to provide a mecha nism of the first above mentionedcharacter in which the parts are so positioned and arranged as toenhance their ease of movement and prevent wear.

Other objects will be in part obvious and in part pointed outhereinafter.

The invention accordingly consists in the features of construction,combinations of elements and arrangement of parts which will beexemplified in the construction hereinafter set forth, and the scope ofthe application of which will be indicated in the fol lowing claims.

In the accompanying-drawings wherein is shown one of the variouspossible embodiments of this invention,'Figure 1 is, a plan view of thebalancing mechanism with certain parts shown in section to more clearlyillustrate their structure; Fig. 2 is an end elevational view partly insection; and Fig. 3 is a diagrammatic view showing the rela-' tiveposition of the carriage in its upper central and lower shiftedpositions.

Similar reference characters refer to similar parts throughout thedifferent views of the drawings.

The present'invention will be hereinafter described with relation to itsapplication to the Noiseless Typewriting Machine although it is, ofcourse, to be understood that the various features are applicable toother machines. The Noiseless machine is, as is well known, of thedouble-shift style in which the carriage preferably occupies a normalintermediate or central position and is shifted upwardly for printingcapitals and downwardly for printing figures for example. The type whichcoact therewith are pressure-operated, or, in other words, print bypressure in contradisti'nc'tion to exerting an impact or blow upon thepaper as in other forms of machines. They obtain this result, in part,by having their path of ,travel limited by the type action independentlyof the position of the platen, and, for this reason, it is desirable tohave the platen positioned in a plane in all of its positions parallelto the plane of the faces of the several type on the type carrier. Withthis general structure in mind, attention is called to Figs. 1 and 2, inwhich 1 denotes a portion of the frame of the machine. known as thecenter tie mechanism, which is movable in a fore and aft direction toposition the platen properly with respect to the end of the path oftravel of the type according to the number of impression sheets carriedby the platen. At each side of this member is an upwardly extendingbracket 2' in which is trunnioned a shaft 3. This shaft is provided withrecesses at each end into which fit hardened steel bushings 4 adapted tobe engaged by pointed trunnion screws 5 threaded through the brackets2.- The relative position of these trunnion screws 5 may be properlyregulated and locked in adjusted position by means of lock nuts 6.

shaft by means of taper pins 10, although it may be desired to make theshaft and arms integrally by a single solid dro forging. Passing throughthe ends 0 these arms 7 and 8 are bolts 11 and 12 for securing theforward end oflinks 13 and 14 thereto. These links extend rearwardly, asshown more clearly in Fig. 2, and have their rear end pivotallyconnected by means of trunnion studs 15 to a shift rail 16. At this samepoint are connected vertically disppsed shift links 17, the lower endsof which are connected with the shifting mechanism. The shift rail 16 isprovided with ball-bearing grooves, along which the carriage rail 18 isadapted to travel. This carriage rail supports the carriage and itsassociated parts, such as the platen roller 19 of any desired style. Atthe rear of the carriage rail 18 is a pin 20, to which the carriagedrive mechanism, indicated by the usual tape 21, is adapted to beconnected for moving the carriage in a letter-space direction from righttoleft,

Referring now to the diagrammatic view (Fig. 3), it will be noted thatwhen the carriage is shifted upwardly by means ofthe shifting links 17,the arms .7 and 8 swing downwardly about the trunnion screws 5 as acenter. The arms 7 and 8. however, beingof a shorter radius than thelinks 13 and 14, the latter will have an endwise movement toward therear of the machine so that their rear ends occupy a position verticallyabove the normal central. position of the same points. Likewise, whenthe carriage is shifted downwardly for printing figures, the reversetakes place, and it will be noted that the intermediate, upper and lowershifted positions of the carriage all lie in the same vertical plane. Infact, the carriage may be said to shift in a vertically straight line,as the variations from a straight line vary but a few ten-thousandths ofan inch at any point.

The links 13 and 14 have an endwise movement as well as a pivotalmovement and they are supported intermediate their ends by channeltrunnions 22, which are adapted to turn freely in the sup ortingbrackets 2. The relative position of these trunnions may be adjusted inand out by means of pointed set screws 23 which are locked in adjustedposition by means of a nut 24. Thisadjustment is largely for the purposeof relieving any binding strain which may be exerted adjacent the bolts11 and 12. The link 13 is provided at a point adjacent the trunnion 22with a roller 25 having a vertical pivot when the carriage is in normalposition, for it' will be seen that the tension exerted by the carriagedrive tape 21" is in a direction to urge the link 13 into contact withthe adjacent trunnion block 22. Thus, by providing. a roller at thispoint, a freer endwise movement of the parts is permitted.

As the roller 25 acts as a fulcrum due to the pull of the carriage drivemechanism, ball-bearings 26 are provided at the opposite end between thelink 13 and the head of the connecting bolt 11, thus to reduce frictionat this point.

The operation of this device is believed to be clear from the abovedescription, and a further discussion thereof is thought to beunnecessary.

The resent invention therefore'co'mprises a simp e and practicalmechanism adapted to properly position the carriage with respect to theend of the path of travel of the type; and the parts are capable ofready adjustment and are so positioned and arranged as to permit a freeand rapid movement, as

well as to eliminate wear on the parts at their several connections.

-As many changes could be made in the above construction and manyapparently widely different embodiments of this invention could be madewithout departing from the scope thereof, it is intended that all mattercontained in the above description or shown in the accompanying drawingsshall be interpreted as illustrative and not in a limiting sense.

Having described my invention, what I claim as new'and desire to secureby Letters Patent is:

1. In a typewriting machine, in combination, a fixed part, an armpivoted. thereon, a movable part, a link pivotally connected therewith,said arm and link having their ends pivotally connected, and ballbearings associated with said pivotal connection, said link acting as alever and having a rolling fulcrum. I

2. In a typewriting machine,-in combination, a fixed part, an armpivoted thereon, a movable part, a link pivotally connected therewith,said arm and link having their ends pivotally connected, and ballbearings associated with said pivotal connection, one of said pivotallyconnected parts acting as a lever and having a rolling fulcrum.

3, In a typewriting machine, in combination, a fixed part, an armpivotally connected therewith, a movable part, a linkpivotally connectedwith said movable part and said arm and'being supported intermediate itsends on said first part, said means of. support being a grooved trunnionin which said link has a longitudinal movement, and a roller associatedwith one of said last-mentioned parts to permit freedom of movement.

4. In a typewriting machine, in combination, a fixed support, adjustabletrunnions in said support, adjustable trunnion screws in said support, ashaft supported by said trunnion screws, a shift rail, andlinkage'between said shaft and said shift rail, a part of said linkageadapted to have a longitudinal movement in said trunnions as said shiftrail is moved.

5. In a typewriting machine, in combination, a relatively fixed support,trunnion screws mounted thereon, a shaft between said screws, armsmounted on said shaft, links pivotally connected with the'ends of saidarms and extending rearwardly of the machine, a shift rail to whichopposite ends of said links are pivotally connected, and means forshifting said shift rail, said links being adapted to have alongitudinal movement when said shift rail is actuated.

6. In a typewriting machine, in combinasaid links are pivotallyconnected, means for shifting said shift rail, said links being adaptedto have a longitudinal movement when said shift rail is actuated, andadjustable grooved trunnions supporting said links intermediate theirends.

7. In a typewriting machine, in combination, a relatively fixed support,trunnion screws mounted thereon, a shaft between said screws, 1 armsmountedon said shaft, links pivotally connected with the ends of saidarms and extending rearwardly ofthe machine, a shift rail to whichopposite ends of said links are pivotally connected, means for shiftingsaid shift rail, said links being adapted to have a longitudinalmovement when said shift rail is actuated, adjustable grooved trunnionssupporting said" links intermediate their ends, and a roller bearingassociated With one of said links to-permit freedom of movement as ittravels in said trunnion.

8. In a typewriting machine, in combination, a fixed support, arotatable trunnion mounted therein, a link adapted to movelongitudinally insaid trunnion, and means for adjusting said trunnion ina direction transverse to the movement of the link.

9. In a typewriting machine, in combination, a fixed support, arotatable trunnion mounted therein, a link adapted to movelongitudinally in said trunnion,-means for adjusting said trunnion in adirection transverse to the movement'of the link, and -a roller carriedby one of said parts to permit freedom of longitudinal movement of saidI link.

10. In a typewriting machine, in combination, a fixed support, arotatable trunnion mounted therein, a link adapted to movelongitudinally insaid trunnion, means for adjusting said trunnion in a'direction transverse to the movement of the link, and a roller carriedby said link engaging said trunnion.

In testimony whereof I 'afiix my signature, in the presence of twowitnesses.

NILS H. ANDERSON.

Witnesses: I

FRANCIS A. Bnaou, EDWARD A. Wmoox.

